Lab Exercise # 9 Operational Amplifier Circuits
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1 Objectives: THEORY Lab Exercise # 9 Operational Amplifier Circuits 1. To understand how to use multiple power supplies in a circuit. 2. To understand the distinction between signals and power. 3. To understand the principle of feedback. 4. To explore some of the many ways in which operational amps (opamps may be used in electronic instrumentation and measurement. Figure 9. 1 shows the configuration of an opamp and its simplified equivalent circuit. Noninverted input Inverted input Figure 9.1 (a Opamp configuration Figure 9.1(b Simplified equivalent circuit For an ideal opamp, the open loop gain A (OL and the input resistance R in are very large, and the output resistance R out is very small. Typical values of A, R in and R out are 10 5, 2 MΩ and 75 Ω respectively. Analysis of an opamp circuit can be made simple by assuming that (1 The voltages at the inverting input and at the noninverting input are equal and (2 The currents entering these terminals are negligible. (3 Almost all opamp circuits use feedback. The principle is that the output oltage is whatever it needs to be to make the input oltages balance. If the opamp circuit is operating properly, out is NOT close to either supply oltage, and =. Pin Configuration: Positive Power Supply S (or CC Output S (or EE Negative Power Supply The pin configuration for the generalpurpose Opamp LM741 is as in Figure 9.2. A dot or a circular/semicircular cut on the top surface of the device will identify pin 1. (If you are given a different opamp to work with, you should refer the data book provided by the manufacturer for the pin configuration and the specifications regarding the supply voltage and other important parameters. We won t use the offset null pins. in R in R out A ( out EE283 Laboratory Exercise 9 Page 1
2 Figure 9.2 Pin Configuration (top view of the LM741 Opamp, Top iew Power Supply to an Opamp: offset null 1 LM741 8 no connection inverting input 2 S 7 positive supply ( CC noninverting input 3 6 out output negative supply ( 4 5 EE S offset null The LM741 will be supplied with 15 olts for s (CC and 15 olts for s (EE. Adjust the right variable unit of the power supply unit to provide 15 olts (using the DMM to measure the voltage and the left unit to provide 15 volts. The Common terminal (positive end of left supply, negative end of right supply may be connected to the (protective Ground terminal of the power supply unit as well as the Ground connection for the circuits. The positive terminal (right unit provides s (CC and the Negative terminal of the left unit provides s (EE for the opamp. This is shown in Figure 9.3. S (or EE 5 S Power supply Black = negative terminal Red = positive terminal Green = protective (earth ground (or CC Connections to circuit Figure 9.3. Power Supply Connections to an Opamp Basic Steps for Opamp Connections: a. Insert the opamp so that it straddles the breadboard trench. HANDLE WITH CARE AND DO NOT FORCE THE INSERTION. You may break one of the legs. b. Be careful to keep the wiring neat and compact. This will minimize the chance of unwanted instability and oscillation in these highgain circuits. c. Use one of the long rows along the edges of the breadboard for the Ground connection. d. Use colorcoded wiring. Use Red (or Yellow for the positive supply, White (Black for banana leads since there s no White for the negative supply, Black for ground. Procedure: 9.1 oltage amplifier It is often desirable to boost the sensitivity of a voltmeter, and also reduce its loading effect on the measurement. Both are achieved by the circuit in Figure 9.4. The resistor EE283 Laboratory Exercise 9 Page 2
3 potentiometer circuit is used to supply a DC oltage. The signal generator is substituted for this to supply an AC input signal. 10KΩ 1KΩ potentiometer S 1 R 1 R 2 O Measure with oscilloscope or DMM note: connect opamp power supplies (not shown Figure 9.4. oltage Amplifier Assuming the opamp to be ideal, and remembering that due to feedback =, show that voltage gain A = 0 1 = R 1 R 2 R 1 ( Assume that the voltage 1 to be measured is of the order 0.8 volt (DC. Since the opamp will saturate at about 15 volts, choose R 2 and R 1 for a gain of, say, 11 (As the lab instructor directs. Measure the resistor values using a DMM. (Suggested values are 10 kω and 1 kω for a factor of 11 difference. 2. Supply the unknown oltage, and measure the output oltage. (Use the DMM or the oscilloscope. 3. Calculate the gain of the amplifier, A = Compare it with calculated gain as given by equation ( Repeat this measurement for an AC sinusoidal voltage (the frequency may be 1 khz and the input voltage about 1 peakpeak. 6. Repeat Step # 5 for an input voltage of 4 (pp. What do you observe? 9.2 Electronic Integrator Figure 9.5 shows an integrating circuit. It is called a negative integrator since the signal goes to the negative terminal of the opamp. C v I (t R R f v o (t Figure 9.5 Negative Integrating circuit EE283 Laboratory Exercise 9 Page 3
4 Assuming an ideal opamp, and also that the value of R f is very large compared to the capacitive reactance, derive the relation below. Recall that feedback means that =. v 0 (t = 1 RC ò v 1(tdt ( Connect the circuit shown in Figure 9.5. Choose the values of R and C as 1000 Ω and 0.05 µf respectively (or as directed. To get a better stable pattern, you can connect a resistor R f of value between 100 kω and 1 MΩ across the capacitor. Connect the input to channel 1 and the output to channel 2 of the oscilloscope. 2. Supply a square wave oltage at about 2 khz and about 6 peaktopeak (or as appropriate. erify the waveform is symmetrical about the timeaxis, or equivalently, it has a positive and negative maximum of 3 and 3. Draw neatly the input and output waveforms, one below the other for easy comparison, and record important characteristics. Repeat this for a sine waveform and a triangular waveform. Choose appropriate peak values and frequencies like the square waveform. Record the input and output waveforms. 9.3 oltage Follower 1. Use two 1.0 MΩ resistors to construct a oltage divider between 15 and ground. Measure and record the oltage drop between the two resistors and ground using (a analog oltmeter, (b two digital multimeters (the one in the lab kit and the lab DMM, and (c oscilloscope. Does the oltage range selected on the measuring instrument affect the oltage values observed? 2. Construct the oltage follower circuit shown in Figure 9.6. Now, feed the oltage from the oltage divider to the oltage follower input and measure the oltage follower output. Compare this measurement to those without the oltage follower, in terms of accuracy, and explain your results. S 1MΩ 1MΩ 15 in O Measure with analog meter, DMMs,oscilloscope Figure 9.6 oltage Follower 9.4 Report: Fill out the form report and hand it in at the end of the lab period EE283 Laboratory Exercise 9 Page 4
5 Lab Exercise # 9 Date: Operational Amplifier Circuits Students: Section: Station: 9.1 oltage Amplifier Circuit: R1= (nominal (measured R2= (nominal (measured For DC: in: out: Measured Gain: Calculated gain: For AC: Sketch Input and output waveforms (properly annotated graphs Sketch circuit Frequency = Input oltage = ( 9.2 Negative Integrator Circuit: R1= (nominal (measured C= (nominal R f = (nominal Sketch Input and output waveforms (properly annotated graphs for sinusoid Frequency = Input oltage = ( EE283 Laboratory Exercise 9 Page 5
6 9.2 Negative Integrator Sketch Input and output waveforms (properly annotated graphs for square wave Frequency = Input oltage = ( Sketch Input and output waveforms (properly annotated graphs for triangle wave Frequency = Input oltage = ( 9.3 oltage Follower: Direct measurement: Analog: DMM(lab DMM(kit scope: oltage follower: Analog: DMM(lab DMM(kit scope: Explanation: EE283 Laboratory Exercise 9 Page 6
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